Which institution was responsible for stabilizing the final successful boysenberry variety developed by Rudolf Boysen?

Answer

Oregon State University researchers

While horticulturist Rudolf Boysen initially developed the cross in the 1920s, the subsequent research team that managed to stabilize the fragile hybrid into the successful, viable variety recognized today was comprised of researchers based at Oregon State University. This stabilization process was crucial in bringing the fruit to a point where it could be cultivated beyond Boysen's initial experimental grounds.

Which institution was responsible for stabilizing the final successful boysenberry variety developed by Rudolf Boysen?
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